Piston rod actuated valve for fluid motors of the expansible chamber type



Dec. 30, 1947. w, E 2,433,759

PISTON ROD ACTUATEDv VALVE FOR FLUID MOTORS OF THE EXPANSIBLE' CHAMBER TYPE Filed June 17, 1944 I INVENTOR. l9 WILLIS C. Hess ,frmk/vfirs.

QWOM M'Qu Patented Dec. 30, 1947 PISTON -ROD-AGTU'ATED VALVE FOR FLUID:

MO ORS 20F- THE; EXPANSIBLE, CHAD/[BER TYRE:

Willis-CIHess; Buffalo; N: Y;, assignorto Trico Products Corporation, Buffalo, N. Y;

App1ication.-June..1,7,.1944,.Serial No. 540,840; r

6 Claims:

This invention relatestoa fluidmotor and primarilytothe automatic valve mechanism for reversing ,thepressure, differential on ,the. piston I or,moving1p,art' of,,the motor. Snap action valve mechanism are well known and are of "various designs, someuti lizing ,the construction ,wherein, the. line, of ,spring, force is shifted ,across a hi h point sometimes, ,ref,erred.to as a dead" center" position The object of the present inventionis taprovidean improvedvalve action wherein the springenergy is stored up for subsequent. release by, a mechanical interlock, with the, power actuating.

member of the .motor.

A further objectofthe invention is to p ovide a valve. action whichis efficient and practical against-any stickingor failureof thevalve while insuring a consistent ,and uniform timingof op eration.

In the, drawing:

Fig- 1 is .aiverticalmsectional view through the improvedvvalve action and ,a-fragment of the mo: tor to. which it is, applied.

Fig. 2 is .artopuplan viewotthevalve action;

and

Fig. 3 is anexploded view more clearly showing the release arrangement.

Referring more. particularlyio. the drawings, the numeral, i l, indicates a, fuel, pump chamber having. a .valved, inlet 2; and. a valved outlet ,3j'for, the. displacementoi liquidiuel or, other fluid by motor chamber, is ,providemwith apart 9, opening, thereintoationeiside of .the pis ton Biand a pair, ofrports IlLandJ i op nin nto thev h m:

ber, at. the, oppositeuside oithe piston. These hree... ports, are, connec d assagewa s 9, p rts l 3 and arespectiv ly, open n h ou h,

a valve seat.,! 5.0.1; ,which Slides, a valve] 5 ,adapt;

ed to connecta ,pressureisuhplv 1 9111,. 1 I.-- natelv to the, ,chambjer communicating ports 1 and rand opening-the. ventin port ;wh n the.

p r s L ndi'l 'are onne e The portsl l1 nd,

l3' could be combined with the ports I] and if;

desired, by, shortening, the slide bearing cgntact communicates, withsthe, source oi operating pres;

sure, either, positiveor, negative ;sucl'1 asthe in;

take ni l ni. sualin ernal combust on engine,ofnanlau bmob lai.

The valve I6 is moved'back and forth on its seat'bv means of an operatingmember --l 9 formed with a pair of upstanding ears 2!] which support a guiderod 2!. Interp osed between the ears and mounted, on the rod is-a pair of springs 22 and 23, and interposed betweenthese springs is asleeve 01' collar,24 which is slidable on the guide rod ,Zttoalternately compress the two springs. The collar 24 is formed with a groove 25 adapt-ed to receive, inturned lugs, 26 provided on the lower ends of a pair of, rocker arms 21, these rods in turn beingintegrally connected with an arm 28 to form in effect 'a bell crank lever having journal support on a shaft, 2,9'fixed in'a surrounding Wall 36. The outer end of the rocker arm 28 has pivotal support in, a recess 3l' formedin a cross head 3!, the latter being detachably secured by a nut.32 to an extension section 33 of the piston rod;1. As the piston 6 is fluid driven back and forth it will, rock thebell crank lever and effect the alternate compressionand release of the two springs in succession,

To hold the, operating member 19 against movement during compression of either spring the power member is formed with a release device which, for practical purposes, may be a part of the cross head 3|. To this end the cross head is provided witha part 34 extending in the direction of movement of the-extension 33am transversely of' the slide or operating member I92" This part 34 is disposed within a cut-out or opening 35 that has a pair of opposed and inwardly extending keeper lugs 36 which bear against one face or the other of the part 34 during compression of the springs, and when theparticular spring hasbeen compressed a'predetermined degree lugs 36 will pass through the oppositely disposed notches or recesses 31 in the release part 34 or over the lower free end'of the latter a the case may be. The extent of travel of "piston 6 is limited to and by the spacing of the notches Slabove the lower edge of the release part 34 and is such as to preclude the withdrawal of the arm 28 from the recess 3|. The operating member l9 is slidably arranged within the 'w-elLdefined by the upstanding surrounding wall 353 and in order to provide clearance for the movement of the release part 34 back and forth throughthe opening 35 said operating member is offset from the bottom wall'3B of the well, as indicated at33. Guiding lugs lllretain the slide in place.

In operation, and assuming the parts tube in the position-shown in Fig. 1, the suction influence will beconveyed; to the lower side of the piston-6 while the-uppersideisopen to the atmosphere through port l3, thereby causing downward movement of the plunger 4 and a rocking of the bell crank lever 21, 28 to compress the left hand spring 22 until the recesses or notches 31 come to a position opposite the lugs 35 whereupon the latter will pass through the recesses under the urge of such spring. This passage of the lugs will shift the valve to uncover port I2 to the atmosphere and connect ports l4 and I! while blocking or closing the port l3, whereupon the suction will be admitted to the upper end of the motor chamber 5 for creating the desired pressure differential with the atmospheric pressure entering the lower end of the chamber through port 9. movement of the motor the bell crank lever will release the spring 22 and compress the spring 23 while the keeper lugs 36 slide with increasing pressure against the left face of the keeper part 34 until such keeper lugs are free to pass across the lower end of said part under the urge of the spring 23, which action will return the valve is to the position illustrated in Fig. 1.

The cross head 3| may be replaced by another having a longer or shorter extension of the release part '34 to vary the motor stroke and conse quently the fluid displacement of the plunger 4. From the foregoing it will be observed that the power actuator unit 6, 3| during the major portion of its movement on either stroke, will store up energy in one spring or the other to be subsequently expended when the keeper lugs 35 are released by the part 34. The energy storing mechanism has no part passing through a dead center position or any other position where it might become stalled against-functioning to shift the valve.

While the foregoing description has been given in detail for clarity, it is not intended thereby to restrict the invention since the inventive principles involved may be applied to other physical embodiments without departing from the scope and spirit of the invention claimed.

What is claimed is:-

1. Automatic valve action for reversing the application of fluid pressure to the opposite sides of a piston, or the like, comprisinga movable valve member, an actuator slidable back and forth and having a relatively fixed arresting part, said valve member having a slide part connected thereto for movement in a path transverse of the path of said arresting part and engageable thereby first on one side and then on the opposite side to hold the slide part against movement first in one direction and then in the reverse. one of said parts straddling the other part with one part having oppositely disposed notches and the cooperating part having oppositely extending keeper lu s en a ing said one part but passable through the notches to release said valve. and spring means conditioned by the actuator for moving the slide part back and forth in its transverse path when released by said'arresting part.

2. Automatic valve action for reversing the application of fluid pressure to the opposite sides of a piston. or the l ke, comprising a movable valve member, an actuator adapted for movement back and forth by such piston. a slide member operatively connected to the valve member for shifting the latter back and forth between two operative positions, said slide member being in the form of an open frame through which the actuator moves at ri ht angles to the path of movement of the frame, spring means During this upward actuator back and forth between two operative carried by the slide frame, and means operable by the actuator for storing up energy in the spring means, said actuator having a fixed part movable back and forth through the slide frame and cooperable with the latter for releasably holding the slide frame arrested until a predetermined energy storing operation has been determined.

3. Automatic valve action for reversing the application of fluid pressure to the opposite sides of a piston, or the like, comprising a movable valve member, an actuator adapted for movement back and forth by such piston, a slide member operatively connected, to the valve member and slidable transversely of the path of the positions, spring means carried by the slide member for actuating the latter, and means operable by the actuator for conditioning the spring means to so actuate said slide member, said actuator having an arresting part movable transversely across the path of movement of a co-operating part on the slide member for holding the latter arrested until said spring means have been conditioned and thereafter releasing said slide member part for the spring actuation of the slide member thereby disposing the slide.

member part on the opposite side of the actuator part for arresting the slide member against reverse movement until the spring means are again conditioned.

4. Automatic valv action for reversing the application of fluid pressure to the opposite sides of a piston, or the like, comprising a movable valve member, an actuator adapted for movement back and forth by such piston, a slide member operatively connected to the valve member for shifting the latter back and forth between two operative positions, and spring means carried by the slide member for actuating the latter, said actuator being in the form of a cross head having one arm acting upon said spring means to condition the same for so actuating the slide member and a second arm serving to hold the slide member against movement during the conditioning of the spring means and thereafter to release the slide member for spring actuation.

5. Automatic valve action for reversing the application of fluid pressure to the opposite sides of a piston, or the like, comprising a movable valve member, an actuator adapted for movement back and forth by such piston, a slide member operatively connected to the valve member for shifting the latter back and forth between two operative positions, spring means carried by the Slide member for actuating the latter, said actuator being in the form of a cross head having one arm acting upon said spring means to condition the same for so actuating the slide member and a second arm serving to hold the s ide member against movement during the conditioning of the spring means and thereafter to release the slide member for spring actuation, and a bell crank lever interposed between the spring means and the first arm for being rocked by the latter to so condition said spring means.

6. Au omatic valve action for reversing the application of fluid pressure to the opposite sides of a piston, or the like. comprising a movable valve member, an actuator adapted for movement back and forth by such piston, a slide member operativelv connected to the valve member for shifting the latter back and forth between two operative positions, and spring means carried by the slide member for actuating the latter, said actuator being in the form of a cross head having one arm acting upon said spring means to condition the same for so actuating the slide member and a second arm serving to hold the slide member against movement during the conditioning of the spring means and thereafter to release the slide member for spring actuation, said slide member having an opening through which said second arm operates, the opposite margins of the opening in the slide member being provided with opposed inwardly extending lugs, and said second arm having marginal recesses to pass the lugs from one side to the opposite Side of the arm subsequent to a conditioning operation of the spring means.

WILLIS C. HESS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

